diff options
Diffstat (limited to 'llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp')
-rw-r--r-- | llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp b/llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp new file mode 100644 index 0000000000000..20781cef2d33a --- /dev/null +++ b/llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp @@ -0,0 +1,114 @@ +//===- WasmObjcopy.cpp ----------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "WasmObjcopy.h" +#include "Buffer.h" +#include "CopyConfig.h" +#include "Object.h" +#include "Reader.h" +#include "Writer.h" +#include "llvm-objcopy.h" +#include "llvm/Support/Errc.h" + +namespace llvm { +namespace objcopy { +namespace wasm { + +using namespace object; + +static Error dumpSectionToFile(StringRef SecName, StringRef Filename, + Object &Obj) { + for (const Section &Sec : Obj.Sections) { + if (Sec.Name == SecName) { + ArrayRef<uint8_t> Contents = Sec.Contents; + Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr = + FileOutputBuffer::create(Filename, Contents.size()); + if (!BufferOrErr) + return BufferOrErr.takeError(); + std::unique_ptr<FileOutputBuffer> Buf = std::move(*BufferOrErr); + std::copy(Contents.begin(), Contents.end(), Buf->getBufferStart()); + if (Error E = Buf->commit()) + return E; + return Error::success(); + } + } + return createStringError(errc::invalid_argument, "section '%s' not found", + SecName.str().c_str()); +} +static Error handleArgs(const CopyConfig &Config, Object &Obj) { + // Only support AddSection, DumpSection, RemoveSection for now. + for (StringRef Flag : Config.DumpSection) { + StringRef SecName; + StringRef FileName; + std::tie(SecName, FileName) = Flag.split("="); + if (Error E = dumpSectionToFile(SecName, FileName, Obj)) + return createFileError(FileName, std::move(E)); + } + + Obj.removeSections([&Config](const Section &Sec) { + if (Config.ToRemove.matches(Sec.Name)) + return true; + return false; + }); + + for (StringRef Flag : Config.AddSection) { + StringRef SecName, FileName; + std::tie(SecName, FileName) = Flag.split("="); + ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr = + MemoryBuffer::getFile(FileName); + if (!BufOrErr) + return createFileError(FileName, errorCodeToError(BufOrErr.getError())); + Section Sec; + Sec.SectionType = llvm::wasm::WASM_SEC_CUSTOM; + Sec.Name = SecName; + std::unique_ptr<MemoryBuffer> Buf = std::move(*BufOrErr); + Sec.Contents = makeArrayRef<uint8_t>( + reinterpret_cast<const uint8_t *>(Buf->getBufferStart()), + Buf->getBufferSize()); + Obj.addSectionWithOwnedContents(Sec, std::move(Buf)); + } + + if (!Config.AddGnuDebugLink.empty() || !Config.BuildIdLinkDir.empty() || + Config.BuildIdLinkInput || Config.BuildIdLinkOutput || + Config.ExtractPartition || !Config.SplitDWO.empty() || + !Config.SymbolsPrefix.empty() || !Config.AllocSectionsPrefix.empty() || + Config.DiscardMode != DiscardType::None || Config.NewSymbolVisibility || + !Config.SymbolsToAdd.empty() || !Config.RPathToAdd.empty() || + !Config.OnlySection.empty() || !Config.SymbolsToGlobalize.empty() || + !Config.SymbolsToKeep.empty() || !Config.SymbolsToLocalize.empty() || + !Config.SymbolsToRemove.empty() || + !Config.UnneededSymbolsToRemove.empty() || + !Config.SymbolsToWeaken.empty() || !Config.SymbolsToKeepGlobal.empty() || + !Config.SectionsToRename.empty() || !Config.SetSectionAlignment.empty() || + !Config.SetSectionFlags.empty() || !Config.SymbolsToRename.empty()) { + return createStringError( + llvm::errc::invalid_argument, + "only add-section, dump-section, and remove-section are supported"); + } + return Error::success(); +} + +Error executeObjcopyOnBinary(const CopyConfig &Config, + object::WasmObjectFile &In, Buffer &Out) { + Reader TheReader(In); + Expected<std::unique_ptr<Object>> ObjOrErr = TheReader.create(); + if (!ObjOrErr) + return createFileError(Config.InputFilename, ObjOrErr.takeError()); + Object *Obj = ObjOrErr->get(); + assert(Obj && "Unable to deserialize Wasm object"); + if (Error E = handleArgs(Config, *Obj)) + return E; + Writer TheWriter(*Obj, Out); + if (Error E = TheWriter.write()) + return createFileError(Config.OutputFilename, std::move(E)); + return Error::success(); +} + +} // end namespace wasm +} // end namespace objcopy +} // end namespace llvm |